Ferrite core



FIG. 1 is a front view illustrating an embodiment of a ferrite core according to our new design.

FIG. 2 is a back view thereof.

FIG. 3 is a top plan view thereof.

FIG. 4 is a bottom view thereof.

FIG. 5 is a side elevational view from the left thereof.

FIG. 6 is a side elevational view from the right thereof.

FIG. 7 is a perspective view thereof. 

The ornamental design for a ferrite core, as shown and described. 